Johnson’s amendment is probably the most important one of all of them.
Will be interesting to see what the vote count is on it, as clearly any deal with Iran that lifts all sanctions would be a treaty, despite Zero’s attempts to bypass both the Constitution and Congress.
This article references the Johnson amendment.
http://www.washingtontimes.com/news/2015/apr/28/frank-gaffney-senates-institutional-suicide/
The importance of this vote can not be overstated. If it goes down in defeat, not only is a massive blow to the Constitution but the chance of an Israeli-Iranian war goes up.